Hey totally lost on a project

hey there im not looking for a step by step tutorial on how to make this but even just an idea of what to google or whre to find what this style is called im very new to flash and im totally lost. http://tutvid.com/tutorials/flash/tutorials/slideOutInfoPanels.php i dont need to know how to do the tutorial just the panels that expand before he starts the tutorial. what is this called is it a transition or an actionscript and what kind. i really appreciate any advice you can give me thank you.